Secondary lining supplementary grouting indoor simulation test device

Abstract

The present invention relates to the field of tunnel lining grouting construction test, and in particular to the field of secondary lining supplementary grouting indoor simulation test device, including: a transparent chamber; a grouting channel, which is connected to the water outlet of the transparent chamber; an exhaust channel, which is connected to the transparent chamber; a screen assembly, which is provided with an inlet, an outlet and a screen, and the inlet of the screen assembly is connected to the chamber; a piston for moving along the gravity direction is provided in the transparent chamber, the upper cavity of the piston is used to simulate the cavity of the secondary lining of the tunnel, the grouting outlet of the grouting channel is located in the cavity, the air inlet of the exhaust channel is located in the cavity, and the screen assembly is connected to the cavity. The use of this device to intuitively reflect the supplementary grouting effect of the tunnel secondary lining can help researchers study and improve the secondary lining supplementary grouting method under various working conditions, and play a guiding role in engineering practice.

Description

Technical Field

[0001] The invention relates to the field of tunnel lining grouting construction test, in particular to the field of secondary lining supplementary grouting indoor simulation test device. Background Art

[0002] Tunnel construction occupies an increasingly large proportion in my country's transportation civil engineering field. In 2018, my country fully launched the planning and construction of the Sichuan-Tibet Railway, and tunnels account for as much as 70% of the Sichuan-Tibet Railway. When building a tunnel, the first grouting will leave a large cavity on the top of the lining, and supplementary grouting of the secondary lining is required. If the supplementary grouting cannot achieve a qualified filling effect on the secondary lining, the tunnel vault will be loose, causing the "two-layer skin" phenomenon. Due to the concealment and invisibility of the supplementary grouting, how to test the effect of the tunnel supplementary grouting and how to improve the supplementary grouting technology of the tunnel secondary lining have become a difficult problem in the tunnel grouting process. Summary of the invention

[0003] The purpose of the present invention is to provide an indoor simulation test device for supplementary grouting of secondary lining, which can simulate the results of supplementary grouting of secondary lining under various working conditions and response conditions during supplementary grouting of secondary lining of tunnel by using a simple structure, and is used for guiding the effect of supplementary grouting of secondary lining of tunnel.

[0004] In order to achieve the above purpose, the technical solution adopted in this application is a secondary lining supplementary grouting indoor simulation test device, including:

[0005] Transparent chamber;

[0006] A grouting channel, the grouting channel is connected to the water outlet of the transparent chamber and is used to inject slurry into the chamber;

[0007] An exhaust channel connected to the transparent chamber for simulating a condition where the tunnel secondary lining is completely closed or not completely closed;

[0008] A screen assembly, the screen assembly is provided with an inlet, an outlet and a screen, the inlet of the screen assembly is connected to the chamber, and the screen assembly is used to simulate the seepage situation when there are gaps of different sizes in the tunnel lining;

[0009] Among them, a piston for moving along the direction of gravity is arranged in the above-mentioned transparent chamber, the cavity above the above-mentioned piston is used to simulate the cavity of the second lining of the tunnel, the discharge port of the above-mentioned grouting channel is located in the cavity, the air inlet of the above-mentioned exhaust channel is located in the cavity, and the above-mentioned screen assembly is connected to the cavity.

[0010] When in use, before conducting indoor simulated grouting, set the conditions for simulated grouting first. Inject the slurry to be injected from the grouting channel into the cavity of the transparent chamber, adjust the size of the cavity by adjusting the height of the piston, and simulate the cavity volume of the tunnel secondary lining. Adjust the height of the grouting outlet of the grouting channel to simulate different grouting depths. Adjust the closed state of the air outlet switch to simulate the conditions of complete or incomplete closure of the tunnel secondary lining. Adjust the opening and closing of the water outlet 4 switch to simulate whether there is a gap in the tunnel secondary lining, and adapt to the lining gap corresponding to different heights of the adjustable piston. Use a screen assembly to simulate different tunnel gap sizes. After making the above adjustments, start grouting, control the designed grouting speed, and stop grouting when the target pressure is reached. At this time, the grouting fullness and grouting state in the cavity can be directly observed, and the water output at the outlet of the screen assembly can be measured.

[0011] The present invention adopts a simple test device to simulate various working conditions during the supplementary grouting of the secondary lining of the tunnel and the results of the supplementary grouting of the secondary lining under corresponding conditions, and intuitively reflects the effect of the supplementary grouting of the secondary lining of the tunnel, which is helpful for relevant engineering personnel to have a preliminary understanding of the effect of the supplementary grouting of the secondary lining under corresponding working conditions. At the same time, it can help researchers to study and improve the secondary lining supplementary grouting methods under various working conditions, and play a guiding role in actual engineering.

[0012] Furthermore, the transparent chamber is provided with at least two water outlets 4 arranged along the gravity direction, and each of the water outlets 4 is connected to the screen assembly.

[0013] In this way, the lining gaps corresponding to different heights can be simulated over a larger range.

[0014] Furthermore, the screen assembly comprises a tube body connected to the water outlet of the chamber, and the tube body is provided with a screen connecting portion for placing the screen in the tube body.

[0015] In the actual tunnel secondary lining supplementary grouting construction, the situations are various, and the water seepage gaps are also different, so the simulation situation of the gaps needs to be changed frequently. Therefore, in the process of simulating the tunnel secondary lining gaps, the replacement of the screen plate simulating the gaps requires a more convenient operation method. Therefore, the present invention adopts a screen connection part set on the pipe body.

[0016] Specifically, the pipe body is provided with a mounting groove, the screen connection part includes a screen mounting seat adapted to the mounting groove, the screen mounting seat is an arc-shaped structure that fits the pipe body wall, and the inner side of the screen mounting seat is provided with a slot for mounting the screen. In this way, the positioning of the screen is achieved, and the screen installation is also guaranteed not to be offset. By setting the above-mentioned screen mounting seat, when the screen needs to be replaced, the screen can be installed on the screen mounting seat, and then the screen mounting seat is embedded in the mounting groove to complete the replacement of the screen. This is very suitable for the needs of the tunnel secondary lining supplementary grouting simulation experiment for gap simulation, and the screen can be replaced more easily and conveniently.

[0017] Preferably, a locking buckle can be provided on the tube body and the screen mounting seat. When the screen mounting seat is completely embedded in the tube body, i.e. closed with the tube body, it is locked by the locking buckle. In order to provide a seal between the screen mounting seat and the tube body, a sealing gasket can be inserted at the edge of the screen mounting seat.

[0018] Furthermore, one end of the screen mounting seat is hinged to a groove edge of the mounting groove; or, the screen mounting seat and the pipe body are split structures.

[0019] Furthermore, the water outlet 4 is connected with a leakage branch pipe, and the leakage branch pipes are all connected to a leakage main pipe extending along the gravity direction, and the leakage main pipe is connected to the inlet of the screen assembly.

[0020] Furthermore, the secondary lining supplementary grouting indoor simulation test test device also includes a water tank provided with a scale, and the upper opening of the water tank is used to correspond to the outlet of the above-mentioned screen assembly to facilitate the measurement of water leakage from the transparent chamber.

[0021] Furthermore, the exhaust channel and the grouting channel can be movably provided on the piston to facilitate the adjustment of the height of the air inlet of the exhaust channel and the outlet of the grouting channel.

[0022] Preferably, a sealing ring may be provided between the exhaust channel, the grouting channel and the piston to achieve better sealing.

[0023] Preferably, flanges with a diameter larger than the diameter of the channels are provided on the air inlet of the exhaust channel and the outlet of the grouting channel to prevent the grouting channel or the exhaust channel from escaping from the cavity when the grouting channel or the exhaust channel is raised or lowered.

[0024] Furthermore, a pressure detection device for detecting the air pressure in the cavity is provided on the wall of the transparent chamber, so as to facilitate observation by the operator during grouting and ensure the safety and reliability of the test. The pressure detection device may be a pressure gauge, a pressure detector, or the like.

[0025] Furthermore, an air valve connected to the cavity is arranged on the wall of the transparent chamber to release the pressure inside the cavity after the test.

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Additional aspects and advantages of the present invention will be partially given in the following description, partially become apparent from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present invention are used to assist in understanding the present invention. The contents provided in the drawings and their related descriptions in the present invention can be used to explain the present invention, but do not constitute improper limitations on the present invention. In the drawings:

[0028] Figure 1 A schematic diagram of a test device for a secondary lining supplementary grouting indoor simulation test for the present application;

[0029] Figure 2 is a schematic diagram for illustrating the screen assembly of the first embodiment;

[0030] Figure 3 It is a radial schematic diagram for explaining the screen assembly tube body of the second embodiment;

[0031] Figure 4 It is a schematic axial view for explaining the screen mounting seat and the tube body of the screen assembly of the second embodiment when they are unfolded;

[0032] Figure 5 It is a radial schematic diagram for explaining the screen assembly tube body of the third embodiment;

[0033] Figure 6 It is a schematic axial view for explaining the screen mounting seat and the tube body of the screen assembly of the third embodiment when they are unfolded;

[0034] Markings in the figure: 1-transparent chamber, 2-pressure gauge, 3-air valve, 4-water outlet, 5-screen assembly, 510-tube body, 511-installation groove, 512-screen mounting seat, 513-lock, 6-piston, 7-grouting channel, 8-exhaust channel, 9-solid adjustment rod, 10-water tank, 11-screen, 12-sealing gasket. DETAILED DESCRIPTION

[0035] The present invention is described clearly and completely below in conjunction with the accompanying drawings. A person skilled in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly noted that:

[0036] The technical solutions and technical features provided in each part of the present invention, including the following description, may be combined with each other if there is no conflict.

[0037] In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] About the terms and units in the present invention: The term "comprise" and any variation thereof in the description and claims of the present invention and related parts are intended to cover non-exclusive inclusions.

[0039] like Figure 1 and 2 Embodiment 1: A module test device for indoor supplementary grouting of a tunnel secondary lining, comprising a transparent chamber 1, a pressure gauge 2, an air valve 3, a water outlet 4, a screen assembly 5, a piston 6, a grouting channel 7, an exhaust channel 8, a solid adjustment rod 9 and a water tank 10. A piston 6 movable along the direction of gravity is arranged in the transparent chamber 1, the cavity above the piston 6 is used to simulate the cavity of the tunnel secondary lining, the grouting outlet of the grouting channel 7 is located in the cavity, the air inlet of the exhaust channel 8 is located in the cavity, and the screen assembly 5 is connected to the cavity.

[0040] At least two of the water outlets 4 are arranged in the direction of gravity on the transparent chamber 1, and each of the water outlets 4 is connected to the screen assembly 5. The screen assembly 5 includes a pipe body 510 connected to the water outlet 4 of the chamber, and the pipe body 510 is provided with a screen connection part for placing the screen 11 in the pipe body 510. The water outlet 4 is connected to a leakage branch pipe, and the leakage branch pipes are all connected to a leakage main pipe extending in the direction of gravity, and the leakage main pipe is connected to the inlet of the screen assembly 5. The pipe body 510 and the water outlet 4 of the transparent chamber 1 can be connected by a flange.

[0041] The upper opening of the water tank 10 is used to correspond to the outlet of the above-mentioned screen assembly 5. The above-mentioned exhaust channel 8 and grouting channel 7 can be movably penetrated on the piston 6 to facilitate the adjustment of the height of the air inlet of the exhaust channel 8 and the outlet of the grouting channel 7. A sealing ring can be arranged between the exhaust channel 8, the grouting channel 7 and the piston 6 to achieve better sealing. A flange with a diameter larger than the diameter of the channel is arranged on the air inlet of the above-mentioned exhaust channel 8 and the outlet of the grouting channel 7 to prevent the grouting channel 7 or the exhaust channel 8 from escaping from the above-mentioned cavity when the grouting channel 7 or the exhaust channel 8 is raised or lowered.

[0042] The transparent chamber 1 is a cylindrical box with an open lower end made of high-strength transparent glass, forming a grouting container, which can reflect the fullness and progress of the grouting in real time.

[0043] The pressure gauge 2 is arranged at the center of the top surface of the transparent chamber 1 and is made of a common pressure tester to measure the pressure of the cavity in the device.

[0044] The air valve 3 is arranged on the top surface of the transparent chamber 1 and is used to release the pressure generated in the cavity of the device after the grouting is completed.

[0045] The above-mentioned water outlet screen is arranged on the side of the transparent chamber 1, and is formed by connecting multiple water outlets 4. The terminal water outlet 4 is connected to the screen assembly 5, which is used to simulate the seepage situation when there are gaps of different sizes in the tunnel lining.

[0046] The screen assembly 5 includes screens 11 of various mesh sizes for simulating tunnel lining gaps of different sizes.

[0047] The piston 6 is arranged inside the transparent chamber 1. The partition is made of ordinary durable material. The partition is penetrated by the grouting channel 7 and the exhaust channel 8, and is connected to a solid adjusting rod 9, which is used to form a closed cavity with the transparent chamber 1 and control the volume of the cavity.

[0048] The grouting channel 7 is connected to the piston 6 and passes through the piston 6. It is made of a stainless iron pipe and is used for injecting slurry.

[0049] The exhaust channel 8 is connected to the piston 6 and passes through the piston 6. Its opening and closing state is controlled by a switch. When the switch is turned on, it is used to simulate the situation where the tunnel lining is not completely closed during grouting, and can simulate the vertical position of the leakage gap in the secondary lining of the tunnel.

[0050] The solid adjusting rod 9 is vertically fixed to the piston 6 and is used to move the position of the piston 6 .

[0051] The water tank 10 is placed at the end of the water outlet 4, and is used to contain the water seeping from the water outlet 4 and measure the volume of the water seeping.

[0052] Before conducting indoor simulated grouting, the conditions for simulated grouting are set first. The height of the piston 6 is adjusted by the solid adjusting rod 9 to adjust the size of the cavity and simulate the cavity volume of the tunnel secondary lining. The height of the grouting channel 7 and the air outlet pipe 10 are adjusted to simulate different grouting depths and air leakage port heights. The closed state of the air outlet switch is adjusted to simulate the conditions where the tunnel secondary lining is completely closed or not completely closed. The opening and closing of the water outlet 4 switch is adjusted to simulate whether there is a gap in the tunnel secondary lining. The water outlet 4 switches at different heights are opened and closed to adapt to the lining gaps corresponding to the piston 6 at different heights. Screens 11 with different gap sizes are inserted into the screen assembly 5 to simulate different tunnel gap sizes. After the above adjustments, grouting is started, the designed grouting speed is controlled, the pressure gauge 2 is observed, and the grouting is stopped when the target pressure is reached. At this time, the grouting fullness and grouting state in the cavity can be directly observed, and the water volume in the water tank 10 can be measured. When the test is finished, first open the air valve 3 to release the internal pressure of the cavity, then remove the piston 6, clean the main body of the module test device in the tunnel secondary lining supplementary grouting chamber, and then complete the test and use of the device.

[0053] like Figure 3 and 4 Embodiment 2: On the basis of embodiment 1, the tube body 510 is provided with a mounting groove 511, and the screen connection portion includes a screen mounting seat 512 adapted to the mounting groove 511, and the screen mounting seat 512 is an arc-shaped structure that fits the tube wall of the tube body 510, and the inner side of the screen mounting seat 512 is provided with a slot for mounting the screen 11. One end of the screen mounting seat 512 is hinged to a groove edge of the mounting groove 511. In this way, the positioning of the screen 11 is achieved, and the installation of the screen 11 is also guaranteed not to be offset. By setting the above-mentioned screen mounting seat 512, when the screen 11 needs to be replaced, the screen 11 can be installed on the screen mounting seat 512, and then the screen mounting seat 512 is embedded in the mounting groove 511 to complete the replacement of the screen 11. This is very suitable for the needs of the tunnel secondary lining supplementary grouting simulation experiment, and the screen 11 can be replaced more easily and conveniently. In order to facilitate the opening and closing of the screen mounting seat 512 , a handle or a pull plate may be provided on the outer side of the screen mounting seat 512 .

[0054] Preferably, a lock buckle 513 can be provided on the tube body 510 and the screen mounting seat 512. When the screen mounting seat 512 is completely embedded in the tube body 510, i.e. closed with the tube body 510, it is locked by the lock buckle 513. In order to provide a seal between the screen mounting seat 512 and the tube body 510, a sealing gasket 12 can be inserted into the edge of the screen mounting seat 512.

[0055] That is, one way to set the screen mounting seat 512 is to hinge the screen mounting seat 512 on the tube body 510. When a test is required, the screen 11 is installed on the screen mounting seat 512 and then the screen mounting seat 512 is closed. This is not only convenient, but also an integrated structure and prevents the loss of the screen mounting seat 512. When the screen 11 is installed on the screen mounting seat 512, a slot can be set on the inner side of the screen mounting seat 512, and the screen 11 can be inserted, limited in the axial direction, and fixed by friction in the radial direction.

[0056] like Figure 5 and 6 Embodiment 3: Different from Embodiment 2, the screen mounting seat 512 and the tube body 510 are of a split structure. The screen mounting seat 512 and the tube body 510 are of a split structure. When a test is required, after the screen is installed, the screen mounting seat 512 is embedded in the mounting groove 511. This method can avoid the connection component problem caused by the connection between the screen mounting seat 512 and the tube body 510.

[0057] The above is a description of the relevant contents of the present invention. A person skilled in the art will be able to implement the present invention based on these descriptions. Based on the above contents of the present invention, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. Tunnel secondary lining supplementary grouting indoor simulation test test device, characterized in that: include: Transparent chamber; A grouting channel, the grouting channel is connected to the water outlet of the transparent chamber and is used to inject slurry into the chamber; An exhaust channel connected to the transparent chamber for simulating a condition where the tunnel secondary lining is completely closed or not completely closed; A screen assembly, the screen assembly is provided with an inlet, an outlet and a screen, the inlet of the screen assembly is connected to the chamber, and the screen assembly is used to simulate the seepage situation when there are gaps of different sizes in the tunnel lining; Wherein, a piston for moving along the direction of gravity is arranged in the transparent chamber, the cavity above the piston is used to simulate the cavity of the secondary lining of the tunnel, the grouting outlet of the grouting channel is located in the cavity, the air inlet of the exhaust channel is located in the cavity, and the screen assembly is connected with the cavity; The transparent chamber is provided with at least two water outlets arranged along the gravity direction, and each of the water outlets is connected to the screen assembly; The exhaust channel and the grouting channel can be movably arranged on the piston.

2. The indoor simulation test device for supplementary grouting of the second lining of the tunnel according to claim 1, characterized in that: The screen assembly comprises a pipe body connected with the water outlet of the chamber, and a screen connecting portion for placing the screen in the pipe body is arranged on the pipe body.

3. The indoor simulation test device for supplementary grouting of the second lining of the tunnel according to claim 2, characterized in that: The tube body is provided with a mounting groove, and the screen connection part comprises a screen mounting seat adapted to the mounting groove, the screen mounting seat is an arc-shaped structure matched with the tube wall of the tube body, and a slot for mounting the screen is provided on the inner side of the screen mounting seat.

4. The indoor simulation test device for supplementary grouting of the secondary lining of the tunnel according to claim 3, characterized in that: One end of the screen mounting seat is hinged to a groove edge of the mounting groove; or the screen mounting seat and the pipe body are split structures.

5. The indoor simulation test device for supplementary grouting of the second lining of the tunnel according to claim 1, characterized in that: The water outlet is connected with a leakage branch pipe, and the leakage branch pipes are all connected to a leakage main pipe extending along the gravity direction, and the leakage main pipe is connected to the inlet of the screen assembly.

6. The indoor simulation test device for supplementary grouting of the second lining of the tunnel according to claim 1, characterized in that: It also includes a water tank with a scale, and the upper opening of the water tank is used to correspond to the outlet of the screen assembly.

7. The indoor simulation test device for supplementary grouting of the secondary lining of a tunnel as claimed in claim 1, characterized in that: A pressure detection device for detecting the air pressure in the cavity is arranged on the wall of the transparent chamber.

8. The indoor simulation test device for supplementary grouting of the secondary lining of a tunnel as claimed in claim 1, characterized in that: An air valve communicating with the cavity is arranged on the wall of the transparent chamber.

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